It is more then likely it does go out of sync at that point. It turns out the AC3 files I have for ANH are damaged / corrupted :( IIRC the 2nd AC3 file is missing the equivalent of about 6 frames (@25 fps) of audio just before where the pilot in the briefing goes:

"Forgive me for asking sir, but what good are stunt fighters going to be against that?"

Comparing the AC3s to my LD captures the missing audio is just silence/ambient noise so when I release my audio fix for the 97SE I should be able to fix this quite easily with what I know now. :)

I don't plan to work on the audio fixes for my 97SE LD preservations until I have finished my Technicolor project which is going to take at least another 6 weeks to complete.